Antiskid device



June 24, 1930. .1. CAMPANARO ANTISKID DEVICE v Filed Feb. 28, 1925 J04 fawwana/eo.

who

affozuu Patented June 24, 1930 J nn c vresimao, or Beltane-Le a, e un t tvama I ANTLSKI DEV CE Application filed February 28, 1925. seine No. 12,298;

his. invention relates. to; anti-Skid devices for vehicle wheels and particularly to those vehicle wheels equipped with pneumatic tires. 1

The primary object of my invention; isthe provision of an improued' anti-skid device for vehicles. equipped: with pneumatic tir s Another object of my invention is the provision of an anti-skid device having ground engaging sections and-ground gripping devices movable relatively to the-ground ensections. V Other and further ob ects. will be appar-.

ent. to thoseskil'led: in the art, from a-rcad-j ing of the complete specificationandi claims. Referring to the drawing wherein I have illustrated a preferred embodiment of the invention, l i

Fig. 1 is a side elevation of a. vehicle tireshowing my invention attached thereto and having portions cut away tor expose the inner construction more-clearly. i 1

Fig. 2 is a cross section of Fig. 1. "Fig. 3 is a cross. section of; a larger tire than that illustrated in Fig. 2 and. showing a construction-of my invention applicable to such a tire.

Fig. 4: is a plan view of the ground contacting portion of a section of my invention.

Figs. 5 and 6. illustrate one means ofbringing the ends of my structure together when attaching the same to a wheel.

Like reference characters refer to similar parts throughout the several views.

Referring particularly to Figs. 1 and 2, 10 designates a portion of a pneumatic tire, of a vehicle, to which my invention is applied.

Curved segments 11 extend around the outside of the tire and are of such a shape that they fit the curved outer ground contacting portion of the tire. These sections are of maximum thickness at the line of contact with the ground and taper oii' to no thickness as shown at 12 adjacent the middle of the tire. A sufiicient clearance is provided between the sides of the tire and the tapered portions 12.

The sections are hinged together with a suitable, hinge structure l3, the component pintle bearing parts: otwhich may be con structed as shown, as a part oi; the ad;- jacent segments themselves. The pintle of the: hinge consists of an ordinary rivet as at re except at such place or places; as it, may be desired to have a removable pintle. At such. points as it is desired to separate the gments, Eprevide steel. co r pins inplace er the rivet. l4; @ne of} these pins I have-illustrated; at 1'5;

Betweenjthe inner tapering edges of; each two adjacent segments, I provide: a taperingclearance which, in the smaller size tires, may amount'to, about one eighth of an inchacljacent inner portion and tapere ing outwardly so that when, the tapered. portions of adjacent segments are together, due to: the flexibility of the tire, the two edgesof these. segments willgl; abut throughout their lengths.

Referring now particflularliyto Figs. 1;, 2 and 4, it. will: be noted that the segmen 11 are provided with spaced openin 's 16 which are Located} the cylindrical is an-ks 1 7 of the" gronnd contacting heads 18,. The. inner ends of thefshanks 17; are secured in a suitable .way, as by riveting,fto'the tire contacting pad 19. Inthie fOIm f 11 vention shown in Figs; 1,2; and; 4;, two, ground contacting heads. 18 are secured by theirshanks 1? to. one; pad; 1 9. These two heads are air nged side by side in a diree tion parallel to. thewheell axis, so that they win; in theusual course oi operation, en-. the" ground at the same time. Adjacent pads 19 are placed close toreach other but not suiiiciently close to cut the surface of the ,tire. The holes 16, are sufliciently arg to perrnit of free meivementof the s nks 17 in the direction of their axes. The heads 18 are previfded-with crossgrooves 26) for causing a; better grippin-g v action with the ground. i

In. the modification illustrated in Fig. 3

for a larger tirepthe pad ISYhassecured thereto, three shanks 17" to, the end of-each oi which issecured a head 18;. These three shanks. pass. through corresponding openings 16' in the segment 11 and operate similarly to the shanks 17 in the openings 16 previously described.

Referring particularly to Fig. 1 wherein I have illustrated the operation of my invention, it will be seen that when the heads 18 engage the ground, the shanks 17 move upwardly in their openings 16, causing the pads 19 to press against the tire. The tire will yield, permitting three or more sets of heads 18 to be in yielding contact with the ground. This construction upon hard ground gives a very smooth riding action and minimizes the shocks due to rough places. When, however, the Vehicle is in soft ground, the shanks are extended to their maximum length and, with their heads, have a very effective gripping action with the ground.

It will be observed that should a stone be encountered, no shock is felt, due to this yielding action of the pad pressing against the tire.

The hinge portions are preferably more on the outside periphery of the segments in order to facilitate the rolling of the attachment as a whole when not in use.

In very soft'ground, the wheels are prevented from spinning and even if any slight movement should take place, the segment will not prevent sharp stones to cut the tire as would be the case with anti-skid devices which expose the tire.

In Figures 5 and 6, I have illustrated one method of attaching the ends of the antiskid device together. The device is preferably constructed in such a way that it will fit snugly over the tire. Since the presence of dirt and the increase of size as tires grow older make it necessary to draw the ends together, I provide pairs of jaws 40, 41. The jaws 40 have openings 42 spaced apart a distance equal to the distance between centers of the shanks of the ground gripping members. Similar openings are provided at 43 on the jaws 41.

A block 44 having a threaded opening is integral with the jaws 40 and a block 44, having an opening therethrough, is integral with the jaws 41. A shaft having a collar 45 passes through the opening in the block 44 and has a threaded end 46 which cooperates with the threaded opening in the block 44. On the end of the shaft is a crank 47 which when turned, brings the jaws 40, 41

" closer together or farther apart as it may be desired.

In use the ends of the anti-skid device are brought as close together as possible by hand. The jaws 40, 41 are then applied to the ends, the openings 42, 43 registering with theshanks of the ground gripping devices. The handle being turned, the ends of the segments are brought together and the split cotter pin inserted in the hinge member 7 openings.

While I have shown and described my invention in detail I desire to have it understood that I do not limit myself to the exact showing and that modifications and changes may be made without departing from the spirit of my invention and within the scope of the appended claims.

Having described my invention what I claim is 1. An anti-skid attachment for vehicle wheels comprising a member of a shape to follow the contour of the outside periphery of the tire, said member having hinged sections constructed to articulate when in operation, the sections engaging the periphery and sides of the tire, and ground gripping means coacting independently with a plurality of sections, and each having a tire engaging portion and a plurality of shanks extending from the tire engaging portion through its section of the member and having portions outward of the outer periphery of-the member.

2. An anti-skid attachment for vehicle wheels comprising a member of a shape to follow the contour of the outside periphery of the tire, the member comprising hinged sections articulating with the tire when bearing on the ground and having portions engaging the periphery and sides of the tire and ground gripping means coacting with a plurality of sections, and each having a tire engaging portion and a plurality of shanks extending from the tire engaging portion through its section of the member and having portions outward of the outer periphery of the member and'heads thereon to engage the ground.

In testimony whereof I hereunto affix my signature.

JOHN CAMPANARO. 

